Discriminative ability of functional loading tests for adolescent jumper's knee

Purdam, Craig R., Cook, Jill L., Hopper, Diana M., Khan, Karim M., & Griffiths, Lyn R. (2003) Discriminative ability of functional loading tests for adolescent jumper's knee. Physical Therapy in Sport, 4(1), pp. 3-9.

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Objective. To investigate the reliability and validity of five squat-based loading tests that are clinically appropriate for jumper's knee. The loading tests were step up, double leg squat, double leg squat on a 25-degree decline (decline squat), single leg decline squat, and decline hop.

Design. Cross-sectional controlled cohort. Subjects without knee pain comprised controls, those with extensor tendon pain comprised the jumper's knee group.

Setting. Institutional athlete study group in Australia

Participants. Fifty-six elite adolescent basketball players participated in this study, thirteen comprised the jumper's knee group, fifteen athletes formed a control group.

Intervention. Each subject performed each loading test for baseline and reliability data on the first testing day. Subjects then performed three days of intensive (6 h daily) basketball training, after which each loading test was reexamined.

Main outcome measures. Eleven point interval scale for pain.

Results. The tests that best detected a change in pain due to intensive workload were the single leg decline squat and single leg decline hop. This study found that decline tests have better discriminative ability than the standard squat to detect change in jumper's knee pain due to intensive training. The typical error for these tests ranged from 0.3 to 0.5, however, caution should be exercised in the interpretation of these reliability figures due to relatively low scores.

Conclusions. The single leg decline squat is recommended in the physical assessment of adolescent jumper's knee. The decline squat was selected as the best clinical test over the decline hop because it was easier to standardise performance.

Impact and interest:

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ID Code: 62771
Item Type: Journal Article
Refereed: Yes
DOI: 10.1016/S1466-853X(02)00069-X
ISSN: 1466-853X
Divisions: Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2003 Springer Netherlands
Deposited On: 23 Sep 2013 00:47
Last Modified: 08 Nov 2013 05:30

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